Program to swap two numbers without using temporary variable

/* Aim : program to swap to varibles without using temp variables*/ #include<stdio.h> #include<conio.h> int x,y; int swap(int x,int y) { x=x+y; y=x-y; x=x-y; printf("After swapping numbers are :\n first is %d\n second is %d",x,y); } int main() { printf("Enter first variables \n"); scanf("%d",&x); printf("Enter second varibles \n"); scanf("%d",&y); swap(x,y); getch(); }